sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, milky white to pinkish color, vitreous luster, trigonal crystal system, and conchoidal fracture with no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, milky white to pinkish color, vitreous luster, trigonal crystal system, and conchoidal fracture with no cleavage.
Formation & geological history
Formed through the mechanical weathering and water-transport erosion of larger quartz-bearing rocks, smoothing into a rounded pebble over long periods.
Uses & applications
Commonly used in landscaping, decorative gravel, aquarium substrates, and occasionally lapidary arts for tumbling.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Easily identified in the field by its high hardness (scratches glass) and lack of effervescence with acid; found worldwide in riverbeds and beaches.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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